TCP/UDP常见的端口号
简单介绍参考，
Various TCP and UDP ports - GeeksforGeeks
列表如下，
| PORT | Service | Description | Transport Protocol |
|---|---|---|---|
| 7 | Echo | Port just echoes whatever is sent to it. This feature can be used in many attacks, such as Smurf/Fraggle. | TCP and UDP |
| 20 /21 | File Transfer Protocol (FTP) | Port used by FTP protocol to send data to the client | TCP |
| 22 | Secure Shell (SSH) | Used as secure replacement protocol for Telnet | TCP and UDP |
| 23 | Telnet | Port used by Telnet to remotely connect to a workstation or server(unsecured) | TCP |
| 25 | Simple Mail Transfer Protocol (SMTP) | Used to send E-Mail over internet | TCP |
| 53 | Domain Name System (DNS) | Port for DNS requests, network routing, and zone transfers | TCP and UDP |
| 67 /68 | Dynamic Host Configuration Protocol (DHCP) | Used on networks that do not use static IP address assignment. | UDP |
| 80 | Hypertext Transfer Protocol (HTTP) | Used for browsing web-pages on a browser | TCP |
| 110 | Post Office Protocol (POP3) | Port used to retrieve complete contents of a server mailbox | TCP |
| 143 | Internet Message Access Protocol (IMAP4) | Internet Message Access Protocol (IMAP4) is a new protocol to read an email with a wider range of operations | TCP and UDP |
| 194 | Internet Relay Chat Protocol(IRC) | allows communication in form of text between multiple parties, one or more clients can connect to a centralized server. | TCP and UDP |
| 443 | HTTP with Secure Sockets Layer (SSL) | Port used for secure web traffic | TCP and UDP |
| 3389 | Remote Desktop Protocol(RDP) | Port used by remote desktop to remotely manage other windows system | TCP and UDP |
更多详情参考，
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers